Add a url field to setup.cfg (#45)

Author: anoadragon453

setup.cfg

@@ -4,6 +4,7 @@ description = A web service for scanning media hosted by a Matrix media reposito
 long_description = file: README.md
 long_description_content_type = text/markdown
 version = 1.0.3
+url = https://github.com/vector-im/matrix-content-scanner-python
 
 classifiers =
   License :: OSI Approved :: Apache Software License